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Message-ID: <2025123059-CVE-2023-54265-02a6@gregkh> Date: Tue, 30 Dec 2025 13:20:31 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2023-54265: ipv6: Fix an uninit variable access bug in __ip6_make_skb() From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix an uninit variable access bug in __ip6_make_skb() Syzbot reported a bug as following: ===================================================== BUG: KMSAN: uninit-value in arch_atomic64_inc arch/x86/include/asm/atomic64_64.h:88 [inline] BUG: KMSAN: uninit-value in arch_atomic_long_inc include/linux/atomic/atomic-long.h:161 [inline] BUG: KMSAN: uninit-value in atomic_long_inc include/linux/atomic/atomic-instrumented.h:1429 [inline] BUG: KMSAN: uninit-value in __ip6_make_skb+0x2f37/0x30f0 net/ipv6/ip6_output.c:1956 arch_atomic64_inc arch/x86/include/asm/atomic64_64.h:88 [inline] arch_atomic_long_inc include/linux/atomic/atomic-long.h:161 [inline] atomic_long_inc include/linux/atomic/atomic-instrumented.h:1429 [inline] __ip6_make_skb+0x2f37/0x30f0 net/ipv6/ip6_output.c:1956 ip6_finish_skb include/net/ipv6.h:1122 [inline] ip6_push_pending_frames+0x10e/0x550 net/ipv6/ip6_output.c:1987 rawv6_push_pending_frames+0xb12/0xb90 net/ipv6/raw.c:579 rawv6_sendmsg+0x297e/0x2e60 net/ipv6/raw.c:922 inet_sendmsg+0x101/0x180 net/ipv4/af_inet.c:827 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0xa8e/0xe70 net/socket.c:2476 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2530 __sys_sendmsg net/socket.c:2559 [inline] __do_sys_sendmsg net/socket.c:2568 [inline] __se_sys_sendmsg net/socket.c:2566 [inline] __x64_sys_sendmsg+0x367/0x540 net/socket.c:2566 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Uninit was created at: slab_post_alloc_hook mm/slab.h:766 [inline] slab_alloc_node mm/slub.c:3452 [inline] __kmem_cache_alloc_node+0x71f/0xce0 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node_track_caller+0x114/0x3b0 mm/slab_common.c:988 kmalloc_reserve net/core/skbuff.c:492 [inline] __alloc_skb+0x3af/0x8f0 net/core/skbuff.c:565 alloc_skb include/linux/skbuff.h:1270 [inline] __ip6_append_data+0x51c1/0x6bb0 net/ipv6/ip6_output.c:1684 ip6_append_data+0x411/0x580 net/ipv6/ip6_output.c:1854 rawv6_sendmsg+0x2882/0x2e60 net/ipv6/raw.c:915 inet_sendmsg+0x101/0x180 net/ipv4/af_inet.c:827 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0xa8e/0xe70 net/socket.c:2476 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2530 __sys_sendmsg net/socket.c:2559 [inline] __do_sys_sendmsg net/socket.c:2568 [inline] __se_sys_sendmsg net/socket.c:2566 [inline] __x64_sys_sendmsg+0x367/0x540 net/socket.c:2566 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd It is because icmp6hdr does not in skb linear region under the scenario of SOCK_RAW socket. Access icmp6_hdr(skb)->icmp6_type directly will trigger the uninit variable access bug. Use a local variable icmp6_type to carry the correct value in different scenarios. The Linux kernel CVE team has assigned CVE-2023-54265 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.24 with commit 14878f75abd5bf1d38becb405801cd491ee215dc and fixed in 4.14.313 with commit 165370522cc48127da564a08584a7391e6341908 Issue introduced in 2.6.24 with commit 14878f75abd5bf1d38becb405801cd491ee215dc and fixed in 4.19.281 with commit f394f690a30a5ec0413c62777a058eaf3d6e10d5 Issue introduced in 2.6.24 with commit 14878f75abd5bf1d38becb405801cd491ee215dc and fixed in 5.4.241 with commit 0cf600ca1bdf1d52df977516ee6cee0cadb1f6b1 Issue introduced in 2.6.24 with commit 14878f75abd5bf1d38becb405801cd491ee215dc and fixed in 5.10.178 with commit 605b056d63302ae84eb136e88d4df49124bd5e0d Issue introduced in 2.6.24 with commit 14878f75abd5bf1d38becb405801cd491ee215dc and fixed in 5.15.107 with commit d65ff2fe877c471aa6e79efa7bd8ff66e147c317 Issue introduced in 2.6.24 with commit 14878f75abd5bf1d38becb405801cd491ee215dc and fixed in 6.1.24 with commit 2c9cefc142c1dc2759e19a92d3b2b3715e985beb Issue introduced in 2.6.24 with commit 14878f75abd5bf1d38becb405801cd491ee215dc and fixed in 6.2.11 with commit 02ed5700f40445af02d1c97db25ffc2d04971d9f Issue introduced in 2.6.24 with commit 14878f75abd5bf1d38becb405801cd491ee215dc and fixed in 6.3 with commit ea30388baebcce37fd594d425a65037ca35e59e8 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2023-54265 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/ipv6/ip6_output.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/165370522cc48127da564a08584a7391e6341908 https://git.kernel.org/stable/c/f394f690a30a5ec0413c62777a058eaf3d6e10d5 https://git.kernel.org/stable/c/0cf600ca1bdf1d52df977516ee6cee0cadb1f6b1 https://git.kernel.org/stable/c/605b056d63302ae84eb136e88d4df49124bd5e0d https://git.kernel.org/stable/c/d65ff2fe877c471aa6e79efa7bd8ff66e147c317 https://git.kernel.org/stable/c/2c9cefc142c1dc2759e19a92d3b2b3715e985beb https://git.kernel.org/stable/c/02ed5700f40445af02d1c97db25ffc2d04971d9f https://git.kernel.org/stable/c/ea30388baebcce37fd594d425a65037ca35e59e8
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